کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
4549842 1627488 2014 13 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Impact of the river nutrient load variability on the North Aegean ecosystem functioning over the last decades
ترجمه فارسی عنوان
تاثیر تنوع بار تغذیه ای رودخانه در اکوسیستم اژه شمال شمالی در دهه های گذشته
کلمات کلیدی
مدل سازی، خروجی رودخانه، مواد مغذی تغییرپذیری، شبکه های غذایی، دریای اژه
موضوعات مرتبط
مهندسی و علوم پایه علوم زمین و سیارات اقیانوس شناسی
چکیده انگلیسی


• Long-term (1980–2000) biophysical simulation with varying riverine nutrient load
• Overall productivity decreasing trend following phosphate riverine loads decrease
• Plankton food web dominated by small cells/microbial loop
• Dinoflagellates favoured during periods with increased river nutrient inputs
• Stronger effect of river inputs in the enclosed Thermaikos gulf

The impact of river load variability on the North Aegean ecosystem functioning over the last decades (1980–2000) was investigated by means of a coupled hydrodynamic/biogeochemical model simulation. Model results were validated against available SeaWiFS Chl-a and in situ data. The simulated food web was found dominated by small cells, in agreement with observations, with most of the carbon channelled through the microbial loop. Diatoms and dinoflagellates presented a higher relative abundance in the more productive coastal areas. The increased phosphate river loads in the early 80s resulted in nitrogen and silicate deficiency in coastal, river-influenced regions. Primary production presented a decreasing trend for most areas. During periods of increased phosphate/nitrate inputs, silicate deficiency resulted in a relative decrease of diatoms, triggering an increase of dinoflagellates. Such an increase was simulated in the late 90s in the Thermaikos Gulf, in agreement with the observed increased occurrence of Harmful Algal Blooms. Microzooplankton was found to closely follow the relative increase of dinoflagellates under higher nutrient availability, showing a faster response than mesozooplankton. Sensitivity simulations with varying nutrient river inputs revealed a linear response of net primary production and plankton biomass. A stronger effect of river inputs was simulated in the enclosed Thermaikos Gulf, in terms of productivity and plankton composition, showing a significant increase of dinoflagellates relative abundance under increased nutrient loads.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Sea Research - Volume 86, February 2014, Pages 97–109
نویسندگان
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